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https://issues.apache.org/jira/browse/HBASE-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238968#comment-13238968
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Lars Hofhansl commented on HBASE-5547:
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Was thinking that these files are up grabs unless HBase is in "backup mode",
maybe by the existence of a specific zNode, although other models are possible
as well.
The details are a bit tricky, of course. Do we need a full cleanup between
backup runs so that we do not confuse the backup files? If not, do we tag with
a backup number or a with timestamp (like the HLogs)?
If we do HBASE-50 we won't need this one methinks. This might get us to
workable solution more quickly.
> Don't delete HFiles when in "backup mode"
> -----------------------------------------
>
> Key: HBASE-5547
> URL: https://issues.apache.org/jira/browse/HBASE-5547
> Project: HBase
> Issue Type: New Feature
> Reporter: Lars Hofhansl
>
> This came up in a discussion I had with Stack.
> It would be nice if HBase could be notified that a backup is in progress (via
> a znode for example) and in that case either:
> 1. rename HFiles to be delete to <file>.bck
> 2. rename the HFiles into a special directory
> 3. rename them to a general trash directory (which would not need to be tied
> to backup mode).
> That way it should be able to get a consistent backup based on HFiles (HDFS
> snapshots or hard links would be better options here, but we do not have
> those).
> #1 makes cleanup a bit harder.
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